21403413345320 has 16 divisors (see below), whose sum is σ = 48157680027060. Its totient is φ = 8561365338112.

The previous prime is 21403413345319. The next prime is 21403413345331. The reversal of 21403413345320 is 2354331430412.

It can be written as a sum of positive squares in 2 ways, for example, as 18423032346436 + 2980380998884 = 4292206^2 + 1726378^2 .

It is a super-2 number, since 2×21403413345320² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 267542666777 + ... + 267542666856.

Almost surely, 2^{21403413345320} is an apocalyptic number.

21403413345320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21403413345320 is an abundant number, since it is smaller than the sum of its proper divisors (26754266681740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21403413345320 is a wasteful number, since it uses less digits than its factorization.

21403413345320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535085333644 (or 535085333640 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 35.

Adding to 21403413345320 its reverse (2354331430412), we get a palindrome (23757744775732).

The spelling of 21403413345320 in words is "twenty-one trillion, four hundred three billion, four hundred thirteen million, three hundred forty-five thousand, three hundred twenty".